Expansion valve



FIG. 1 is a front, top, right-hand side perspective view of an expansion valve comprising a new, original and ornamental design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left-hand side view thereof; and,

FIG. 7 is a right-hand side view thereof. 

CLAIM The ornamental design for an expansion valve, substantially as shown. 